ALS: American Philosophical Society
Wednesday 29th [i.e. 31]5 of March 79.
The honour of your company is desired for thursday or friday next, at ten o clock in the morning, at the hotel of M le Marquis de lAubespine Rue de Bourgogne. F S. G. where MM of the Committee will meet.
The new experiments on the Electrical fluid have been postponed till you are present.
I am with respect, Sir Your most obedient humble Servant
5. He must have meant the 31st; he and BF had exchanged letters on the 29th, above.